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  #1  
Old 08-31-2009, 03:55 PM
whj whj is offline
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Posts: 60
Real-time export data to simulink

Hello,

I'm seeking a solution to output position and orientation data to another computer running Simulink in real time. Does anybody have any experience?

Thanks!
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  #2  
Old 09-03-2009, 05:48 PM
farshizzo farshizzo is offline
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Posts: 2,849
Can Simulink read data coming over a network socket? If so, you can use the Python socket module to send data over the network.
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  #3  
Old 09-04-2009, 10:32 AM
whj whj is offline
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I found a UDP Receive block in Simulink. It requires the other end of the communication, which is vizard, to specify the port that receives data. I'm not sure how to do it. I think my code only specifies the port that sends data. Am I missing something?

Code:
import viz
viz.go()

import socket

COMPUTER_IP_ADDRESS = socket.gethostbyname('192.59.88.91')

PORT = 25000 #The port to send data on

OutSocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
OutSocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

def SendData(data):
	OutSocket.sendto(data,(COMPUTER_IP_ADDRESS,PORT))

vizact.onkeydown(' ',SendData,'hello there')
Thanks!
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  #4  
Old 09-04-2009, 05:29 PM
farshizzo farshizzo is offline
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This post shows how to send and receive data on UDP sockets using different ports.
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  #5  
Old 09-05-2009, 09:49 PM
whj whj is offline
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Join Date: Apr 2008
Posts: 60
I'm confused, in the sample code, there is only one port 4999, which is "#The port to send/receive data on". Why does it show using different ports? Thanks.
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  #6  
Old 09-08-2009, 01:51 PM
whj whj is offline
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Join Date: Apr 2008
Posts: 60
So far I'm sure simulink on computer B can receive data from specified IP address and port over UDP. Then my question is, how do I specify the port that the remote computer B accepts data from in vizard on this computer A? Thanks.
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  #7  
Old 09-08-2009, 03:31 PM
whj whj is offline
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Join Date: Apr 2008
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I just got them communicated successfully. PORT = xxxx seems to be used to specify the remote port to receive from. Please forget my previous question.

My next problem is I would like to send two values from vizard to simulink every 0.05 second. My code would be like this:

Code:
import viz
viz.go()

import socket
import random

COMPUTER_IP_ADDRESS = '129.59.82.229'
PORT = 25000 
OutSocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
OutSocket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

def SendData(data):
	OutSocket.sendto(data,(COMPUTER_IP_ADDRESS,PORT))

def mytimer(num):
	value1 = random.randint(0, 70)
	value2 = random.randint(1, 100)
	SendData(value1, value2)


viz.callback(viz.TIMER_EVENT, mytimer)
viz.starttimer(0,0.05,viz.FOREVER)
I know SendData(value1, value2) wouldn't work. Could somebody tell me how to use SendDate at this context.

Thanks a lot.
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  #8  
Old 09-09-2009, 01:16 PM
farshizzo farshizzo is offline
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Posts: 2,849
When sending data using the socket module, the data needs to be a string containing the raw byte data. Have a look at the Python struct module for packing Python integer/float values into raw byte data. The following example shows how to generate raw byte data from 2 integer values:
Code:
import struct
data = struct.pack('ii',value1,value2)
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  #9  
Old 09-11-2009, 10:33 AM
whj whj is offline
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Join Date: Apr 2008
Posts: 60
Thanks a lot. That really helps.
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